Description
The RMR series is completely insulated SF6 Ring Main Unit, This product is in conformity with the standards the GB/IEC standard and the design of a high safety combined switch cabinets. One of the main components of circuit breaker and load break switch, high technical level, superb technology, stable performance, safe and reliable operation.
RMR series SF6 Ring Main Unit will take several functional units and connecting busbar assembly in sealed SF6 gas box, without any live parts exposed, with advantages completely insulated. Live parts maintenance free, small volume, compact structure, convenient operation etc. . The stainless steel plate of cabinet with 3.0mm thick , which can effectively prevent moisture, corrosion caused by salt spray; Products passed the breaking and making test, dynamic thermal stability test, sealing test and mechanical test etc, the maximum guarantee the safety of persons and equipment. The cabinet is suitable for indoor and outdoor installation, and it is not affected by the external environment, with high performance of anti harsh environment
RMR series SF6 Ring Main Unit is widely used in industrial and civil ring network distribution system and power supply terminal, especially suitable for small Secondary distribution substation, urban residential district, and other places
Standards and specifications
Switchgear manufacture
The switchgear complies with the following specifications in accordance with relevant IEC publications:
----IEC62271-200 ----IEC62271-100
----GB3804-2004 ----GB3906-1991
----GB16926-1997 ----GB/T11022-1999
Operating
Normal operating conditions Design to relevant standard, with the following limit values:
a)Air temperature: ±40℃; Daily average ≤25°C
b)Altitude above sea level: Maximum installation altitude: 4000m c)Wind: less than 35m/s;
d)Earthquake intensity: no more than 8 degrees;
Main new advantages of RMR
3.1Main new advantages of RMR
Switch Device
Wide selection of reliable quality switching products are avaiable,the load break switch,vaccum circuit breaker.
4.1 Load break switch
The load break switch is a 3-position switch disconnector and earthing switch using SF6 gas as an arc quenching meduim,the switch positioning is close-open-earthed. In the open position the switch satisfies the disconnector requirements
4.2 Vacuum circuit beaker
4.3 Fuse
By means of tripping device it operates as a switch-fuse combination. Two earthing switches are equipped in both sides of the fuse-links in order to ensure the personal safety of operators.
Note: Fuse selection for transformer protection selection refer to IEC fuse standard.
The accessories
5.1Gas pressure/density meter
Each tank of RMU is equipped with density meter to monitor the gas pressure inside. The pointer of the meter is in the green area, that means the normal pressure in the gas tank, if the pointer is in the red zone, it means the pressure of the tank is low. It is required to periodically inspect the density meter, to ensure the pressure in the normal range. Additionally, density meters with low pressure alarm is also available as an option. The meter is provided as the customer specified.
Type C Bushing
Above components of RMU is standard equipped, any special requirement pls consult us.
CT/Zero sequence CT
Elbow cable connector and relevant accessories
Operating Handle
Protection relay
Dimension of Outdoor application RMU
Note:
Above is dimension for three unit combination, all the dimension about CCC, FFF,CCV, VVV,CVV, CFV, FFV, CCF is same.
Extension way by top connection
For normal Ring main unit combined by three unit together, above picture reference is shown us.If special required more, pls consult us.
